Use the cosine of a sum and cosine of a difference identities to find cos(s+t) and cos(s-t).  sin s = -4/5 and sin t = 12/13, s in quadrant III and t in quadrant I

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A: coss=15sint=35 Here, s and t are in quadrant I

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A: Given that cosx = 8/17 and cscy= 29/21. Now find sin(x+y) and tan(x+y). Here i attached solution of…